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human spares remand op nion.

JOHN C. GREEN, 0F PALMER, MASSACHUSETTS, ASSIGNOR T0 DRAPER CORPORATION,

0F HOPEDALE, MASSACHUSETTS, A. CORPDRATION OF MAINE.

CLAMPING DEVICE FOR HEDDLE BARS OR SUPPORTS.

Application filed March 7, 1919.

To all whom it may concern:

Be it known that 1, JOHN C. GREEN, a citizen of the United States,residing at Palmer, county of Hampden, State of Massachusetts, haveinvented an Improvement in Clamping Devices for Heddle Bars or Supports,of which the following; description, in connection with the accompanyingdrawing, is a specification, like characters on the drawing representinglike parts.

This invention relates to loom harness frames and has for its particularobject the provision of a lamping device for holding in place thedetachable heddle support when the latter is inoperative position.

The invention is an improvement upon that disclosed in the patent to E.S. Stimpson and Charles Short No. 7%,401 granted December 8, 1903, andthe main object-of the improvement is to provide a construction in whichwear and lost motion in the clamping device shall be reduced as much aspossible and in which the device shall be steadied and guided in itsmovements between its operative and inoperative positions.

The nature ofthe invention will appear more fully from the accompanyingdescription and drawings and will be particularly pointed out in theclaim.

The drawings illustrate so much of a loom of an ordinary type as issufficient fora disclosure of the invention together with the preferredform of the invention embodied therein.

In the drawings 4 Figure 1 is a front elevation of a portion of one ofthe harness frames shown sub stantially full size;

Fig. 2 is a view of the construction shown in Fig. 1 lookino' toward theright of Fig. 1;

Fig. 3 is a view in horizontal cross section taken on the line 33 ofFig. l;

Fi 4c is a view-similar to Fig. 1 showing the ownhold in raised orinoperative position.

The invention has to do with that type of loom in which the loom harnessframes are fitted with flat thin metal heddles which generally servealso as warp stop motion controlling detectors. These heddles areslotted at their upper ends and supported by a fiat heddle bar. Tn orderthat the heddles may be removed from and replaced upon this heddle baras required it is removably Specification of Letters Patent.

Patented Sept. 2., EH9,

Serial No. 281,121.

mounted at its ends in the heads of the harness frame and it isnecessary to provide a suitable means for clamping or locking the heddlebar in the head of the harness frame.

The constant raising and lowering of the harness frame in the formationof the shed and the constant vibration of the harness frames which isloosely mounted due to the ar and shock of the loom operation places acontinual strain and jar upon any clampmg device which may be employedfor locking the heddle v supporting .bar in place. Furthermore, it isnot connnerciaily practicable to make the parts of carefully machinedhardened steel and these parts are usually and necessarily made in theform of castings which are sometimes chilled. Consequently it is foundin practice that the parts of the clamping device and the head of theharness frame so wear and cut into each other as after a time to causeunder.-

able noise and rattling, permit a corable amount of lost motion andint-1? with the effective positioning and operation of the harnessframes.

These results are prevented and these difiiculties obviated in thisinvention by providing an additional feature to the constructiondisclosed in'the before mentioned patent to Stimpson and Short.

The construction at each side of the loom frame is the same so that itwill be necessary to describe only that at one side.

The head 1 is provided with a threaded boss 7 to receive the usual sidebar of the harness frame and with an upward projection 8 having anaperture 9 to receive the usual connecting device. The body of the headis provided with the longitudinal slot 10 and at its upper portion thehead is widened at 11 to present the overhanging shoulder 12 at theinner edge of the head. The longitudinal slot 10 is narrowed at itslower portion to form a seat, having its side Walls slightly convergingtoward the bottom, for the heddle bar and a transverse pin 13 eXtendsthrough the head across this seat.

The heddle support or bar 14: is a flat bar slightly wedge-shaped asillustrated and notched at 15 to fit over the pin 13 when the heddlesupport is in its operative position in the harness frame. The heddlesupport is held locked in its operative position by the downhold- Thisdownhold has a shank 16 movable in the longitudinal slot 10. .At theThis enlarged section is of such a size inner end of the shank 16 thedownhold is provided with an enlarged section 17 preferably of a widthequal to thatbf the head.

when the downhold is in operative position shown in Fig. 1 it will fitagainst the. inner edge of the head beneath the overhanging shoulder 12and on top of the heddle support 14. Preferably the enlarged section 17and the shank 16 of the downhold have a groove 18 at the bottom edge tofit over the heddle support. Preferably also the overhanging shoulder 12and the upper surface of the enlarged section 17 are beveled so thatthere is a camming or wedging action between these shoulders.

In this invention the downhold is provided with a tongue 19 extendedupwardly from the enlarged section 17 and of a width 'suflicient to fitclosely in the longitudinal slot 10 of the head. This tongue thus actsto prevent any lateral or rocking movement of the downhold in the slot10 and gives a wide and extended bearing surface between the downholdand the head so that as the downhold is moved between its inoperative'minimized. The tongue thus acts'not the wear will be only to steady andseat firmly the entire downhold in the slot of the head but it also actsto guide and afford an additional bearing for the downhold in itsmovements. When the downhold is raised to its inoperative positionas-shown in Fig. 1 this tongue 19 pro- 'jects up alongside the inneredge of the head.

The downhold as in the patent to Stixnpson and Short already referred tohas its shank 16 prolonged outwardly to form a preferably cylindricalextension 20. A helical spring 21 is mounted on this extension abuttingat one end a washer 22 seated at the outer edge of the head 1 andabutting at the other end a washer 23 held in place by a cotter pin 24.The expansive force of this spring always tends to draw the downholdoutwardly to bring the enlarged section 17 against the inner edge of thehead and also when the downhold is moving to operative position and theinclined shoulder 12 is in engagement with the enlarged section to camthe downhold downwardly into engagement with the heddle support.

The operation of the device is readily unand operative positions thatwas;

derstood and is fully set forth in the before mentioned patent. When itis desired to remove the heddle support the downhold is pressed inwardlyagainst the tension ofthe spring 21 and then raised to a position asshown in F ig. 4. It is held in this raised or inoperative position bythe enlarged section 17 catching against the inner edge of the head. Theheddle support can now be.

removed and replaced. To restore the looking device to operativeposition it is pressed downwardly and as soon as the upper edge of theenlarged section 17 passes the shoulder 12 the spring moves itautomatically into locking position.

During these movements of the locking device the tongue 19 slides in theslot in the widened portion 11 of the head, materially .assists inguiding the downhold, and when the downhold under the shock and jaroccurring in the operation of the loom so that the heddle support isalways firmly locked 'in position.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is:

A loom harness frame comprising a side bar having a head provided with alongitudinal slot and widened at its upper portion to present anoverhanging shoulder at its inner edge; a detachable heddle supportadapted to be seated at its end in the lower portion of the slottedhead; and a downhold having a shank movable in said slot, an enlargedsection at its inner end adapted to be positioned at the inner edge ofthe head beneath the shoulder to lock the heddle support in operativeposition, and a tongue extending upwardly from said enlarged sectionfitting the slot in the head when the downhold is in operative position,guiding the downhold in its moyement and projecting up alongside theinner edge of the head when the downhold is, in inoperative position.

In testimony whereof, I have signed my name to this specification.

JOHN C. GREEN.

